Sample taking apparatus



Oct. 27, 1931. G. A. HUMASON I SAMPLE TAKING APPARATUS Filed F'eb. 16, 1929 INVENTOR.

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Patented Oct. '27, 19,31A i.

UNITED STATES PATENT'oi-FICE A GRANVILLE A. UIMZASON, OF HOUSTON, TEXAS, ASSIGNOR 0F ONE-HALF TO J'. A. LOGAN,

` 0F HARRIS COUNTY; TEXAS SAMPLE TAKING- APPARATUS.

Application filed February 16, 19249. Serial No. 340,491.

pierced by the drill in drilling a well, and' which may belet down into the bore, and withdrawn therefrom' independently of the lo drilling tool employed in making the bore.

y Another object of the invention is to provide a device of the character described embodying novel 4means for locking the core'r taking device in the stem of the drilhng tool, y u' novel means for releasing the same, as well l as novel means for severing the core and trapping 'and retaining the same in the core barrel so that. the core, or sample, may/be withdrawn for inspection. f With the above and other objects in view this invention has particular relation to certain novel features Aof construction, operation and arrangement of parts an example of which is givenLin this specification and illustrated in the accompanying vdrawings,

Figure 1 shows a vertical sectional view of the drilling tool showing the sam le taking device locked therein in position or taking the core, or sample..

Figure 2 shows a similarV view thereof showing the sample taking device 1n pos1t1on to sever the core,

. Figure 3 shows a vertical sectional v1ew of the apparatus showing the core severed and trapped in the core barrel, ready tobe-wlthdrawn, and Figure 4 shows a cross sectlonal view of the core barrel.

Referring now more particularly to the 'drawingswherein like numerals 'of reference designate similar artsin each of the figures the numeral 1 esignates a tubular drill stem, to the `lower end of which a drill bit-..2 isattachedand which is driven by the stem in the usual manner. Ally type ofbit may be employed having a central,I core receiving bore 3. The bit shown is reduced, at its lower end, said reduced portion comprising the radial blades, as 4, which serve as pilots, and I above these pilot blades are the side cutting `Ubore 3 and th'e barrel 7 asthedrillingtool blades 5. Some'of the.` blades-4 and 5 may betoothed, and others provided rwith sharp cutting edges,as shown. Thelower end of the vbore 3 is reduced, Vforming an internal annular shoulder 6, therein. There is a core barrel 7 `in the stem 1, whose lower end section'isdetachable and is formed with separate prongs, or fingers 8 which are inwardly beveled. l1`hese prongs normally rest on the shoulder 6. Around the core barrel 7V there 1s a sleeve 9 whose upper end is inwardly beveled and this sleeve is pinned to the barrel by the frangible pinsl() and with its lower end resting on the upper end of the Shank of the bit 2.. This sleeve 9 has vertical slots .55 11 therein and screwed into the'barrel with their outer ends working in said slots'are the set screws 12, forming interlocking means between said sleeve and the barrel.

Anchored within the stem 1 there is a ring l0 13 having the downwardly converging flexible dogs 14, adapted to engage in one of the external grooves 15 formed around the core barrel and the sleeve 9 and dogs 14 thus servev to lock the core barrel in the stem 1.`

The upper end of the core barrel may h closed by'the plug 16 screwed therein, an which hasan upstanding head 17, attached thereto and whose upper end is convex. Beneath said upper end the barrel-has the lateral ports 18, 18 and beneath these parts there is an internal annular seat 19 above which is the piston valve 20. This valve in lower osition closes the ports 18 to prevent the i ow of the drilling fluid into the' core barrel to contaminate the sample therein, but as the core enters and iills the barrel, the valve will l1ft and uncover the ports 18 and the water in the barrel above the core, or the excess sample forced into-the barrel, will be permitted to escape. l

With the core barrel locked inthe stem, as above described, as vdrilling proceeds a core willbe formed which willbe 'received vby the descends. Drilling fluid-*will be forced down through the stem, but excluded from the core barrel by the valve 20' and" this drilling `fluid will pass on down through the channels 21 in the bit 2, and out in front of the side cutting 10 sample forced into the core barrel will be rel lieved through the ports 18 as above explained.

When the sample is in thebarrel, afishing,

,or grappling, tool is let down into the bore and engaged with the core barrel and the core is severed and trapped in the barrel and the barrel, with the sample therein-is then withdrawn. This fishing tool will now be described This" tool embodies a release sleeve 22, adapted to t over the upper end of the barrel 7 and whose lower end is flared. This sleeve is formed of detachable sections, for assembly, and has the inwardly converging iexy ible dogs 23, therein whose lower ends are beveled inwardly. The upper end of the sleeve 22 has the inwardly extending annular flange 24 through which the hammer 25 works. The lower end of the hammer has the l' enlarged head 26 and connected to the upper end thereofthere is an operating rod, or cable When it is desired to sever the core an withdraw the barrel and core, or other sample,

' the fishing tool is lowered and the release sleeve passes over the upper end of the barrel and between the barrel and dogs 14, releasing the latter from the barrel, and the beveled ends of the dogs 23 are expanded bythe head 17 and said dogs pass over said head 17 and engage underneath it. The hammer 25 is then successively elevated and dropped, the

enlarged upper end 28 thereof strikingv against the upper end of the release sleeve 22. The internal annular shoulder 29, in said release sleeve 22, rests against the upper,` end of the core barrel 7 and said barrel is driven downwardl by `said hammer. The pins 10 will be bro en or sheared andi the fingers 8 will be forced inwardl into Jthe position shown in Figure 3, the slioulder 6 acting as a die for that purpose, and the fingers 8 will thereby sever the core, or sample, and substantially close the lower end of the core barrel to retain the sample therein. The core barrel, with the sample therein, may then be withdrawn from the `drill stem 1.

A s the core barrel is withdrawn the sleeve 9 will readily pass between the dogs 14 and the barrel by reason of the inwardly beveled upper end of said sleeve.

When the core barrel has been withdrawn the detachable lower section thereof may be v removed and the plug 16 unscrewed and the longitudinal sections of the barrel may then be separated to expose the core. As shown in Figure 4 these sections are held together -I-.by tenon and mortise sutures so that one secasserts tion can be separated from the other by relative longitudinal movement of said sections.

ln case it be desired to withdraw the drilling tool with the core barrel therein, the fishing tool described will not be used. ln such case a weight, or hammer is dropped down into the drill stein and it will strike the head 17, shearing the pins 10 and actuating the barrel 7 so as to cause the core severing means at the lower en'd of the barrel to sever and entra the core.y

When the core ta ring apparatus has been withdrawn independent of the stem, leaving the stem and bit in the bore, and then if it be desired to take another core the core barrel described may be assembled and dropped vdown through the stem until the lower end of the sleeve 9 rests upon the upper end of the bit shank and the dogs 14 will lock in place to secure the barrel in the stem ready to re.

ceive the core.

What I claim is:

1. A sample taking apparatus comprising a drill stem, a bit at the lower end thereof having a core receiving bore, a core barrell in the stem aligned with said bore, means at the lower end of the barrel operative upon downward movement of the barrel for sever- -ing a core contained within the barrel, means including yieldable dogs carried by the stem, and an annular abutment on the barrel engageable with the dogs and normally locking the barrel in the stem, means engageable with the barrel, and effective to release said locking means and including a barrel actuatf ing device.

2. A sample taking apparatus comprising a drill stem, a bit at the lower end thereof having a core receiving bore, a core barrel in the stem aligned with the bore, means at the l.1.05

lower end of the barrel operative upon downward actuation of the barrel for severing a core contained within the barrel, yieldable dogs engageable with the barrel and normally locking the barrel in the stem, means engage- .110

able with the barrel and effective to releasel said dogs and including a barrel actuating device, said barrel actuating device being characterized by the provision of a reciprocable hammer.

3. .A sample taking apparatus comprising i a drill stem, a bit at the lower end thereof having a core receiving bore, a core barrel in the stem aligned with said bore, and having an external abutment means at the lower `(1.20

end of the barrel operative upon downward actuation of the barrel for severing a core contained within the barrel, yieldable means n ormally Oengaging said abutment and locking the barrel in the stem, means engageable with 125 the barrel and effective to release said locking Y means and including a barrel actuating device', operable against the upper end of said barrel.

4. A c'oring apparatus comprising a drill .130

mesme stein, .a oarrelvl terein, means operative through the actuation of the barrel for severing a core in the barrel interlocking means. `:between the barrel and stem, and impact means through which the barrel may be actuated to eect the operation of said severing means, said actuating means including also a release sleeve for releasing said interlocking means and means for withdrawing the apparatus from a well bore.

In testimony whereof I have signed my name to this specification.

l GRANVILLE A. HUMASON. 

